<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
</head>
<body>
    <div id="app">
        <input type="checkbox" v-model="checkState">
    </div>
    <script>
        var vm = new Vue({
            el: "#app",
            data:{
                checked:false
            },
            computed: {
                checkState: {
                    get() {
                        return this.checked;
                    },
                    set(val) {
                        console.log(val)
                      //改变它的依赖不能直接改变它的值
                        this.checked = val
                    }
                }
            }
        })
    </script>
</body>
</html>